Instead, I installed CalyxOS and have been using it over a year now and I'm very happy with it. Check it out.
You have to be aware that you give that person root when you use Graphene. All possible technical improvements aside this is a very big risk. He claimed he would step back after the video released, then called that a lie and continued with everything.
Calyx seems to be the best alternative right now without such a risk factor.
As for the personal aspect, the lead developer is definitely not the best representative of the project from a communication perspective as he might not have that kind of social skills (based on his posts). [1]
But he (Micay) is an excellent security researcher, and has an excellent track record when it comes to prioritizing his users. There was a sponsorship in the beginning, where the legal entity, CopperheadOS tried to hijack the whole project. But Micay rather kill the project, than let the users' security suffer and revoked the signing keys. And I'm sure such a betrayal would cause anyone to lose a lot of faith in others' actions.
> Give that person root
Complete bullshit, what root?! And if anything, you are the one who are trying to discredit a project here, by sharing some dumb clickbait video.
[1] I see that there is now a project manager doing most of the communication, which is an excellent solution!